KR20000013023A - Bearing cover of alternative generator for vehicle - Google Patents

Abstract

PURPOSE: A bearing cover of an alternative generator for a vehicle is provided to exhaust easily brush powder by changing a bearing cover to a fan type. CONSTITUTION: A bearing cover of an alternative generator for a vehicle comprises: a stator assembly(15) comprising a stator core(13); a rotor shaft(17) installed to the stator assembly; a spool bobean(20) installed to a center of the rotor shaft; a rotor assembly(25) for combining rotor poles(21,22) and rotor cores(23,24); a brush holder(28) for inserting a brush(29) to magnetize the rotor cores(23,24); a voltage controller(30); a rectifier(31); a bearing cover(26) fixed to the rotor shaft(17) to intercept an alien substance to a rear bearing(16'); and exhaust fans(50,51) for exhausting brush powder into the outside.

Description

Bearing cover of automotive alternator.

The present invention relates to a bearing cover of an automotive alternator, and more particularly, to an improved bearing cover to help discharge of brush dust generated while being in contact with a slip ring.

The automotive alternator is one of the engine electronics, which is connected to the engine and the belt to charge the consumed battery power and to supply the current required for operation with other electronics.

The automotive alternator is largely composed of a stator assembly press-fitted between a driver and a slip ring end frame and a rotor assembly supported by a rotor shaft inside thereof.

Outside the slip ring of the rotor assembly is a configuration that is provided with a voltage regulator and the like to rectify the generated alternating current into a direct current to the battery to charge and maintain the generated voltage in a constant state.

In the AC generator as described above, a pair of cooling fans are fixed to the front and rear of the rotor shaft and rotate together with the rotor shaft to introduce external air through suction holes formed in the driver end frame and the slip ring cover, followed by a rectifier and a voltage regulator. Via a bearing, excitation coil and commutator coil;

The external air passing through these is discharged to the outside of the alternator through the discharge holes formed in the driver end frame and the slip ring end frame to cool the heat generating parts.

However, since the influence of the cooling fan is not applied to the inside of the brush holder or the brush shield in which the brush is connected to the slip ring, the brush powder generated by the slip ring is impossible to discharge.

If it is impossible to discharge the brush powder as described above, since it accumulates in the brush holder or the brush shield, the contact between the brush and the slip ring phase is poor, resulting in a problem in that power generation is not performed because of poor current application to the rotor coil. .

Particularly, when accumulated brush powder flows between slip ring and brush holder phase, overvoltage is generated due to spark phenomenon caused by contact of brush and slip ring at the initial stage of power generation, resulting in damage of the whole AC generator. Problems arise.

Accordingly, the present invention aims to solve the problems as described above, thereby facilitating the discharge of brush powder worn in contact with the slip ring, thereby reducing defects of the alternator and increasing durability, thereby contributing to quality stability.

To this end, the present invention is characterized in that the bearing cover is pressed into the slip ring end frame to support the rotor shaft to improve the bearing cover installed to prevent foreign matter penetration into the shock type to facilitate the discharge of brush powder.

1 is an overall cross-sectional view of an alternator to which the technique of the present invention is applied.

Figure 2 is a cross-sectional view of the bearing cover portion that is the main portion of the present invention.

3 is a plan view of a bearing cover to which the technique of the present invention is applied.

4 is a cross-sectional view of a bearing cover to which the technique of the present invention is applied.

* Description of the symbols used in the main parts of the drawings *

10; Alternator

12; Slip Ring End Frame

16; bearing

19; Slip ring

26; Bearing cover

29; brush

50,51; Discharge wing

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is an overall cross-sectional view of an alternator to which the technique of the present invention is applied, FIG. 2 is a cross-sectional view of a bearing cover portion which is an essential part of the present invention, FIG. The cross section of the bearing cover to which the technique is applied will be described together.

As illustrated in FIG. 1, the stator assembly 15 including the stator core 13 and the stator coil 14 is press-fitted between the driver and the slip ring end frames 11 and 12 as shown in FIG. 1.

The stator assembly 15 is supported by bearings 16 and 16 'fixed to the driver and slip ring end frames 11 and 12, and has a pulley 17' at the front end to receive power. The rotor shaft 17 is provided in the lateral direction.

In the middle of the rotor shaft 17 is coupled to the spool bobbin 20 wound around the rotor coil 18 and connected to the slip ring 19 press-fitted to the rear of the rotor shaft 17, the spool bobbin 20 Outside of the rotor assembly 25 having a plurality of rotor poles (21, 22) having a plurality of rotor poles (21, 22) is coupled to accommodate the spool bobbin 20 is provided.

The brush holder 28 is positioned between the bearing cover 26 and the slip ring cover 27 on the slip ring 19 of the rotor assembly 25, and the battery power is supplied to the inside of the rotor ring through the slip ring 19. A brush 29 is inserted to apply to (18) to magnetize the rotor cores 23 and 24.

Outside of the slip ring 19 as a means for rectifying the voltage regulator 30 for maintaining the voltage generated in the rotor and the stator assembly (15,25) in a constant state and the alternating voltage to a direct current Rectifier 31 composed of a heat sink, a diode and a terminal is provided.

In the operation of the alternator 10 as described above, when the engine is started, the rotor shaft 17 rotates the power of the engine, and at the same time, the power of the battery is connected through the brush 29 connected to the slip ring 19. A current is applied to the rotor coil 18 to generate magnetic force lines in the rotor cores 23 and 24 located outside the rotor coil 18.

At this time, the rotor shaft 17 rotates so that the three-phase alternating current is induced to the stator coil 14 to the diode of the rectifier 31, and the diode receiving the three-phase alternating current is full-wave rectified to be higher than the voltage of the battery. It charges the full-wave rectified current and supplies current to other electronics.

When the voltage exceeds the prescribed value during the power generation process, the voltage regulator 30 operates to maintain a constant voltage state at all times, and the engine is stopped to prevent the current flowing from the battery to the generator to be reversed by the diode. It is the operation that is done.

In the power generation process as described above, the cooling fans 32 and 33 which are fixed to the front and rear sides of the rotor shaft 17 and rotate together with the rotor shaft 17 have external air to the driver end frame 11 and the slip ring cover 27. After flowing through the suction holes (34, 35) formed in the) to cool the heat generating parts such as commutator, voltage regulator, bearing, excitation coil and commutator coil.

After the cooling of the heat generating parts is completed, the external air is discharged to the outside of the alternator 10 through the discharge holes 36 and 37 formed in the driver end frame 11 and the slip ring end frame 12 to cool the heat generating parts. Let's go.

In the present invention, the rear of the bearing cover 26, which is installed between the slip ring end frame 12 and the slip ring phase and blocks foreign substances from entering the rear bearing 16 'fixed to the slip ring end frame 12, is improved. It blocks the inflow of foreign matter into the bearing 16 'and facilitates the discharge of brush dust generated by the engagement of the slip ring 19 and the brush 29.

The configuration of the present invention for this purpose;

The bearing cover 26 is fixed to the rotor shaft 17 so as to rotate together with the rotor shaft 17.

By forming a plurality of discharge wings (50, 51) such as a cooling fan on the outer periphery of the bearing cover 26, brush powder is integrated into the bearing bore 52 and brush holder 28 of the slip ring end frame 12 To be discharged into the space (S) between the slip ring shield 53 is formed.

Of course, the size and spacing of the discharge wings (50, 51) formed in the bearing cover 26 is preferably formed to improve the discharge characteristics of the brush powder with noise reduction.

The action of the present invention as described above;

As mentioned above, when the engine starts, the rotor shaft 17 rotates the power of the engine, and at the same time, the power of the battery is supplied to the rotor coil 18 through the brush 29 connected to the slip ring 19. The magnetic force lines are generated in the rotor cores 23 and 24 located outside the rotor coil 18 to generate three-phase alternating current in the stator coil 14, thereby generating power.

In the power generation process as described above, the cooling fans 32 and 33 which are fixed to the front and rear sides of the rotor shaft 17 and rotate together with the rotor shaft 17 have external air to the driver end frame 11 and the slip ring cover 27. After flowing through the suction holes (34, 35) formed in the) to cool the heat generating parts such as commutator, voltage regulator, bearing, excitation coil and commutator coil.

After the cooling of the heat generating parts is completed, the external air is discharged to the outside of the alternator 10 through the discharge holes 36 and 37 formed in the driver end frame 11 and the slip ring end frame 12 to cool the heat generating parts. Let's go.

At the same time, the bearing cover 26 fixed to the rotor shaft 17 also rotates to discharge the brush powder generated by the connection of the slip ring 19 and the brush 29 to the outside of the alternator 10.

That is, the slip ring shield is formed integrally in the bearing bore 52 and the brush holder 28 of the discharge ring (50, 51) integrally formed in the bearing cover 26, the brush ring slip frame end 12 (53) It discharges into the space S between phases.

In particular, by irregularly forming the size and spacing of the discharge wings (50, 51) integrally formed in the bearing cover 26, the noise phenomenon that can occur due to the rotation of the discharge wings (50, 51) is excluded, brush powder Emission performance of is also improved.

The present invention as described above by improving the bearing cover is installed in order to prevent foreign matter penetration into the bearing is pressed into the slip ring end frame to support the rotor shaft;

By facilitating the discharge of brush powder worn by the contact with the slip ring, it is possible to reduce the occurrence of defects of the alternator and increase the durability to contribute to quality stability.

Claims (3)

A stator assembly (15) comprising a stator core (13) and a stator coil (14) press-fitted between the driver and the slip ring end frames (11, 12); A rotor shaft 17 installed in an inner direction of the stator assembly 15; A spool bobbin 20 wound around the rotor coil 18 and coupled to the slip ring 19 to be coupled to the middle of the rotor shaft 17; A rotor assembly 25 to which rotor cores 23 and 24 having a plurality of rotor poles 21 and 22 are coupled to the outside of the spool bobbin 20; A brush holder 28 into which the brush 29 is inserted into the slip ring 19 to magnetize the rotor cores 23 and 24 by applying battery power to the rotor coil 18 through the slip ring 19. Is provided; Outside of the slip ring 19, the voltage regulator 30 for maintaining the voltage generated in the rotor and stator assembly (15, 25) in a constant state and the rectifier (31) for rectifying the alternating voltage regulated by direct current In the alternator 10 is provided; Rotor shaft 17 is installed between the slip ring end frame 12 and the slip ring phase to prevent foreign material from entering the rear bearing 16 'fixed to the slip ring end frame 12. Fixed to the rotor shaft so as to rotate with the rotor shaft 17; The outer periphery of the bearing cover 26 forms a plurality of discharge wings (50, 51), such as a cooling fan, brush powder generated by the connection of the brush 29 and the slip ring 19 of the alternator 10 Bearing cover of the automotive alternator characterized in that it can be discharged to the outside. The method of claim 1; The brush powder is discharged into the space (S) between the bearing bore 52 of the slip ring end frame 12 and the slip ring shield 53 formed integrally with the brush holder 28, AC Bearing cover of the generator. The method of claim 1; The bearing cover of the automotive alternator, characterized in that the size and spacing of the discharge wings (50, 51) formed in the bearing cover 26 is irregularly formed.